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Position of a point

The position of the point A is obtained by measuring the distance from A to Y'Y parallel with X'X, this gives the value X = 100 mm. Then, the distance from A to X'X is measured parallel with Y'Y to give the value Y = 84. Calcad will indicate the position of the point A by (100, 84). For the point B, proceed in the same way but, to indicate that B is at the left side of the axis Y'Y, give X a negative value. Calcad will then indicate the position of the point B by (-118, 134). Finally, for the point C, which is located under the axis X'X, give Y a negative value. Generally speaking, Calcad will use the letter L for the X or Y value when the indicated point is located on the outline of the sundial. When the value is negative a minus sign precedes the letter L. So, for the point C, Calcad will indicate (-L, -150).

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